When you and Tony were discussing the inputs to U1275 it reminded me of the Tek Made parts book and later the Tek Xref book.
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On 4/27/2018 5:23 AM, JJ wrote:
Bob, thanks for the 155-0067-02 spec sheet and the Xref resources. They're
very informative. Wish I had them 3 weeks ago!
On Fri, Apr 27, 2018 at 1:06 AM, Robert Hay <bobh@...> wrote:
Look in the Tek Cross Reference book page 12-9 has some info on the
152-0502-00 and lesser information on the 152-0397-00. The text is
searchable. It may give you a generic replacement.
I thought the information on U1275 might help understand what it does in
the circuit. TekWiki has several other valuable references on the same
On 4/26/2018 6:48 PM, Yiu On Tony C via Groups.Io wrote:
Hi Robert :
It is a very useful information for me to understand the PSU of 7904 !
On the other hand , I am looking for the data sheets for the fast
recovery rectifier 152-0502-00 ( MBD5300 ) and 152-0397-00 ( MR880 ). It
was because my PSU of 7904 CR1311 and 1312 using replacements having
different shut down result at same loading conditions, it is low loading
RegardTony CheungAPR 27 2018
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Sent: Friday, April 27, 2018 4:12 AM
Subject: [TekScopes] New file uploaded to TekScopes@groups.io
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group.File: 7904 - U1275 IC Information 155-0067-02.pdfUploaded By:Robert
Internals info for U1275 in 7904 mainframe, PS control chip 155-0067-02
from the Tek Made handbook.You can access this file at the URL:
The Groups.io Team